Lots of people who don't understand meme theory think fads are memes, and therefore they're bad or somehow not to be respected.
Fads are memes, but they're not bad. They're temporary/parochial rational memes. In other words, they're ideas that are useful to people in a particular culture for a while. They make life better for those people.
Nothing bad about them. Stop disrespecting young people. (Fads are mostly associated with young people.)